Byju's — cancellation of subscription for byjus course

I had purchased a byjus 9-10 state course for my son. Later i realised that my son is unable to utilize the app efficiently. I believe, it is not the right method for him to study. I tried to cancel the subscription many times, but the customer care kept repeating the word "terms and conditions".
I strongly feel that it is not right to force a customer to use a service and make him pay for it. Especially in these times of economic crisis, as a farmer i find it very hard to pay for a service that i am no longer using.

The subscription number of the course is tnl[protected]
I kindly request the competent authority to look into this matter and stop byju's from looting the money from me.